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Reflection seismic studies over the end-glacial Burträsk fault, Skellefteå, Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. (Geophysics)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. (Seismology)
2010 (English)In: Solid Earth Discussions, ISSN 1869-9537, Vol. 2, p. 307-329Article in journal (Refereed) Published
Abstract [en]

Reflection seismic data were acquired along a ca. 22 km long profile over the end-glacial Burträsk Fault with a nominal receiver and source spacing of 20 m. A steeply dipping reflection can be correlated to the Burträsk Fault, indicating that the fault dips at about 55° to the southeast near the surface. The reflection from the fault is rather poorly imaged, probably due to a jump in the fault and the crookedness of the seismic profile in the vicinity of the fault. A more pronounced steeply dipping reflection is observed about 4 km southeast of the Burträsk Fault. Based on its correlation with a topographic low at the surface this reflection is interpreted to originate from a fracture zone. There are no signs of large displacements along this fault as the glacial ice receded, but it may be active today. Other reflections on the processed seismic section may originate from changes in lithological variations in the supra-crustal rocks or from intrusions of more mafic rock. Constraints on the fault geometry provided by the reflection seismic data will help determine what stresses were required to activate the fault when the major rupture along it occurred.

Place, publisher, year, edition, pages
2010. Vol. 2, p. 307-329
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-137642DOI: 10.5194/sed-2-307-2010OAI: oai:DiVA.org:uu-137642DiVA, id: diva2:378434
Funder
Swedish Research Council
Note

This discussion paper has been under review for the journal Solid Earth (SE). Please refer to the corresponding final paper in SE.

Available from: 2010-12-15 Created: 2010-12-15 Last updated: 2017-12-11Bibliographically approved

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Citation style
  • apa
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